1     /// <summary>
 2     /// 阻止系统睡眠/息屏
 3     /// </summary>
 4     public static EXECUTION_STATE PreventSleep()
 5     {
 6         return SetThreadExecutionState(EXECUTION_STATE.ES_CONTINUOUS | EXECUTION_STATE.ES_SYSTEM_REQUIRED | EXECUTION_STATE.ES_DISPLAY_REQUIRED);
 7     }
 8 
 9     /// <summary>
10     /// 允许系统睡眠
11     /// </summary>
12     public static EXECUTION_STATE AllowSleep()
13     {
14         return SetThreadExecutionState(EXECUTION_STATE.ES_CONTINUOUS);
15     }

1         [DllImport("Powrprof.dll", CharSet = CharSet.Auto, SetLastError = true)]
2         private static extern uint CallNtPowerInformation(
3             SystemInformationClass information,
4             IntPtr inputBuffer,
5             uint inputBufferLength,
6             IntPtr outputBuffer,
7             uint outputBufferLength
8         );

 1     /// <summary>
 2     /// 获取系统执行状态
 3     /// 0表示无，可正常睡眠、息屏
 4     /// 1表示阻止睡眠中，系统无法睡眠
 5     /// 2表示阻止息屏中，系统无法息屏
 6     /// 3表示阻止睡眠以及息屏中，系统无法睡眠、息屏
 7     /// </summary>
 8     /// <returns>返回系统执行状态，如果查询失败，返回<see cref="EXECUTION_STATE.ES_CONTINUOUS"/></returns>
 9     public static EXECUTION_STATE GetSystemExecutionState()
10     {
11         IntPtr ptr = Marshal.AllocHGlobal(sizeof(uint));
12         if (CallNtPowerInformation(SystemInformationClass.SystemExecutionState,
13                 IntPtr.Zero, 0, ptr, sizeof(uint)) == 0)
14         {
15             var objectState = Marshal.PtrToStructure(ptr, typeof(uint));
16             var stringState = objectState?.ToString();
17             if (stringState != "0" && Enum.TryParse(stringState, out EXECUTION_STATE state))
18             {
19                 return state;
20             }
21         }
22         return EXECUTION_STATE.ES_CONTINUOUS;
23     }